Revert of [turbofan] Implement rounding of floats on x64 and ia32 without sse4.1.

Revert of [turbofan] Implement rounding of floats on x64 and ia32 without sse4.1. (patchset #2 id:20001 of https://codereview.chromium.org/1584663007/ )

Reason for revert:
Code is incorrect for -0.

Original issue's description:
> [turbofan] Implement rounding of floats on x64 and ia32 without sse4.1.
>
> The implementation sets the rounding mode flag and then uses the
> cvtsd2si and cvtsi2sd instructions (convert between float and int) to do
> the rounding. Input values outside int range either don't have to be
> rounded anyways, or are rounded by calculating input + 2^52 - 2^52 for
> positive inputs, or input -2^52 + 2^52 for negative inputs. The original
> rounding mode is restored afterwards.
>
> R=titzer@chromium.org
>
> B=575379
>
> Committed: https://crrev.com/fa5d09e547abe79a8c82f780deb980c53ad78beb
> Cr-Commit-Position: refs/heads/master@{#33367}

TBR=titzer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/900b2933480f600bffca650e49b5e581224509bb
Cr-Commit-Position: refs/heads/master@{#33369}

[ahaas, 2016-01-18 16:26:31]

Created Revert of [turbofan] Implement rounding of floats on x64 and ia32
without sse4.1.

[commit-bot: I haz the power, 2016-01-18 16:26:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1593313010/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1593313010/1

[commit-bot: I haz the power, 2016-01-18 16:26:59]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-01-18 16:28:07]

Description was changed from

==========
Revert of [turbofan] Implement rounding of floats on x64 and ia32 without
sse4.1. (patchset #2 id:20001 of https://codereview.chromium.org/1584663007/ )

Reason for revert:
Code is incorrect for -0.

Original issue's description:
> [turbofan] Implement rounding of floats on x64 and ia32 without sse4.1.
> 
> The implementation sets the rounding mode flag and then uses the
> cvtsd2si and cvtsi2sd instructions (convert between float and int) to do
> the rounding. Input values outside int range either don't have to be
> rounded anyways, or are rounded by calculating input + 2^52 - 2^52 for
> positive inputs, or input -2^52 + 2^52 for negative inputs. The original
> rounding mode is restored afterwards.
> 
> R=titzer@chromium.org
> 
> B=575379
> 
> Committed: https://crrev.com/fa5d09e547abe79a8c82f780deb980c53ad78beb
> Cr-Commit-Position: refs/heads/master@{#33367}

TBR=titzer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
==========

to

==========
Revert of [turbofan] Implement rounding of floats on x64 and ia32 without
sse4.1. (patchset #2 id:20001 of https://codereview.chromium.org/1584663007/ )

Reason for revert:
Code is incorrect for -0.

Original issue's description:
> [turbofan] Implement rounding of floats on x64 and ia32 without sse4.1.
>
> The implementation sets the rounding mode flag and then uses the
> cvtsd2si and cvtsi2sd instructions (convert between float and int) to do
> the rounding. Input values outside int range either don't have to be
> rounded anyways, or are rounded by calculating input + 2^52 - 2^52 for
> positive inputs, or input -2^52 + 2^52 for negative inputs. The original
> rounding mode is restored afterwards.
>
> R=titzer@chromium.org
>
> B=575379
>
> Committed: https://crrev.com/fa5d09e547abe79a8c82f780deb980c53ad78beb
> Cr-Commit-Position: refs/heads/master@{#33367}

TBR=titzer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/900b2933480f600bffca650e49b5e581224509bb
Cr-Commit-Position: refs/heads/master@{#33369}
==========

[commit-bot: I haz the power, 2016-01-18 16:28:08]

Patchset 1 (id:??) landed as
https://crrev.com/900b2933480f600bffca650e49b5e581224509bb
Cr-Commit-Position: refs/heads/master@{#33369}